Novartis's pelacarsen fails to cut heart-attack risk in Lp(a) trial
Novartis announced in early September that pelacarsen, a drug designed to lower lipoprotein(a), did not reduce cardiovascular events such as heart attacks, strokes and emergency bypass surgery in patients with existing heart disease. The Lp(a)HORIZON trial had tested whether an 80%-plus reduction in Lp(a) levels would translate into fewer clinical events, but the company has not explained why the trial failed, and did not respond to requests for comment.
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Lp(a) is a genetically determined risk factor that cannot be managed through diet, exercise or existing cholesterol drugs, so researchers had pinned hopes on this new class of therapies to close a major treatment gap. The unexpected failure raises doubts, according to cardiologist Michelle O'Donoghue, about whether lowering Lp(a) numbers alone is enough to improve patient outcomes, which could affect how other Lp(a)-targeting drugs still in late-stage trials are evaluated. Until the cause of the failure is understood, it remains unclear whether the entire therapeutic approach needs rethinking or whether pelacarsen specifically underperformed.
- Novartis's pelacarsen failed to reduce heart attacks, strokes and related events in a major trial despite cutting Lp(a) levels by over 80%.
- Lp(a) is largely genetically determined and has no approved lowering therapy, making the failure a setback for a widely anticipated drug class.
- The reason for the trial's failure is unknown, and Novartis has not commented, leaving the fate of other Lp(a)-lowering drugs in development uncertain.
Source: nature.com — Willyard, 2026-11-03
Published there as: “This cholesterol drug promised to be a game-changer. Why did it flop in the clinic — and is there still hope?”
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